Dynamics and Entanglement in Quantum and Quantum-Classical Systems: Lessons for Gravity

被引：3

作者：

Husain, Viqar ^{[1
]}

Javed, Irfan ^{[1
]}

Singh, Suprit ^{[2
]}

机构：

[1] Univ New Brunswick, Dept Math & Stat, Fredericton, NB E3B 5A3, Canada

[2] Indian Inst Technol Delhi, Dept Phys, New Delhi 110016, Hauz Khas, India

来源：

PHYSICAL REVIEW LETTERS | 2022年 / 129卷 / 11期

关键词：

Back reaction - Classical oscillators - Curved spacetime - Entanglement entropy - Intermediate coupling - Quantum gravity - Quantum-classical systems - Semiclassical theories - Spin 1/2 - Spin-coupling;

D O I：

10.1103/PhysRevLett.129.111302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Motivated by quantum gravity, semiclassical theory, and quantum theory on curved spacetimes, we study the system of an oscillator coupled to two spin-1=2 particles. This model provides a prototype for comparing three types of dynamics: the full quantum theory, the classical oscillator with spin backreaction, and spins propagating on a fixed oscillator background. From calculations of oscillator and entanglement entropy evolution, we find the three systems give equivalent dynamics for sufficiently weak oscillator-spin couplings but deviate significantly for intermediate couplings. These results suggest that semiclassical dynamics with backreaction does not provide a suitable intermediate regime between quantum gravity and quantum theory on curved spacetime.

引用

页数：6